javascript - Regular expression timezone -


i need regular expression valid time zone, tried following one.
i'm not sure it.
please me find out wrong in following regular expression.

edited:

here colon , minutes optional. how can change mandatory.
if there no minutes user should input 00 (+05:00). please me solve issue.

var chkzone = "+05:30" if(chkzone .match(/^(z|[+-](?:2[0-3]|[01]?[0-9])(?::?(?:[0-5]?[0-9]))?)$/)) {     alert('works out'); } else {     alert("time zone wrong") }

the following regex matches timezones mandatory double digit hours/minutes, or letter z:

/^(?:z|[+-](?:2[0-3]|[01][0-9]):[0-5][0-9])$/

explanation:

^            # start of string (?:          # match following non-capturing group:  z           # either literal z |            # or  [+-]        # plus or minus sign  (?:         # followed non-capturing group:   2[0-3]     # either number between 20 , 23  |           # or   [01][0-9]  # number between 00 , 19  )           # end of inner non-capturing group  :           # match literal colon  [0-5][0-9]  # match number between 00 , 59 )            # end of outer non-capturing group $            # end of string

see live on regex101.com.


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